Shearing machines



O 1 1 A. STURTZER 2,766,824

SHEARING MACHINES Filed May 17, 1954 INVE'NIUI? j .Jzialrtz an SHEARINGMACHINES August Sturtzer, Dusseldorf, Germany, assignor to Schloe mannAktiengesellschaft, Dusseldorf, Germany- Applicafion May 17, 1954;Serial No. 430,322

Claims priority, application Germany May 21, 1953 3 Claims; ((31. IM-=47} Ingot shearing machines are known to the upper bladeholder ofwhich is pivoted a lever, which, driven by a stationary crank shaft,executes reciprocating swivelling movements. The lever is then able toraise the lower blade-holder, which can swivel about a stationary axis,through the medium of a tension member. This stationary axis maycoincide with the axis of the crank shaft. These ingot shears arepreferably operated by a reversible method. In them only the upperblade-holder is fixedly adjusted by means of a manually actuated spindleor [the like, and the tension member is attached with an elongated holeto a pin on the lower blade-holder. This construction has thedisadvantage that will be gathered from the following description of aknown constructional example illustrated in Figure 5. is illustrated byFigures 1 to 4.

In the known ingot-shearing machine shown in Figure 5 the upperblade-holder 1 is fixedly adjustable by means of a spindle 2. On theupper blade-holder 1 a lever 4 can rock about a pivot 3, the lever 4being movable by a crank 6, which is mounted on a shaft 5. The crank 6is attached by way of connecting-rod 7 to the lever 4. In reversingoperation, that is, when the shaft 5 is reciprocated in such a way thatthe crank 6 is rotated from the position shown through the upper deadcentre into the corresponding left-hand position, and from here isrotated back again upon the same path, the lower blade-holder 8 islifted each time from its support, since a rod 10, provided with a slot11, raises the lower bladeholder. Therefore the cut is efiected byraising the lower blade 12, while the upper blade remains stationary.Such shears have the advantage that the stroke of the lower blade can beadjusted to the height of the ingot 13 to be cut, so that the lowerblade does not have to execute any idle travel. Now the ingots to be cutmostly have however a thick head. In :order to be able to slide thishead through between the upper and lower blades, the throat apertureshown in Figure 5 is not sufl'icient. Hence for the pushing through thehead of the ingot the upper blade holder 1 has to be adjusted upwardsevery time by hand by means of the spindle 2, while the crank 6 isrotated into the lower dead centre. Since this is very complicated, theupper blade-holder 1 is in operation usually located so high up that allingots, even those with the thickest heads, can be slid into the throataperture. In this way the advantage that the shears described areintended to present is to a great extent lost, for a long idle path nowhas to be traversed for every cut.

Now the object of this invention is to obviate the said disadvantages,and the invention consists in the fea- .ture that the upper blade-holderis freely d-isplaceable in a vertical direction, and in its downwardmovement strikes against an abutment, and that the tension member isrigid and is undisplaceably pivoted to the lower bladeholder and to alever which is rockable on the upper blade holder. The abutment for theupper blade-holder may advantageously be adjustable, so that theshearing The invention itself ice machine can be adjusted for differentthicknesses of the ingots and ingot heads.

The invention is illustrated in Figures 1 to 4 of the drawing, in which:

Figure- 1 shows the shears in the position with the maximum throataperture;

Figure 2 shows the shears after the ingot head has slid through at thebeginning of the cutting work;

Figure 3 shows theshears cat the termination of the cut; and

Figure i -shows the shears-with a throat aperture which isnot so largeas the thickness of the ingot, and permits the displacement of the ingotfor the next cut.

Figure 5 shows an old and well known construction.

The upper blade-holder 1a is slidably supported on a correspondingsupport 20. An abutment 21, which is adjustable with the raid of thespindle 2a, limits the travel of the upper blade-holder 1a in a downwarddirection. At St: is pivoted the lever 4a, which is rocked up and clownby the connecting rod 7a as soon as the crank 6a, which is rotatablewith the undisplaceable crank shaft 5a, is rotated in acounter-clockwise direction. The lever 4a is connected with the lowerblade-holder 8a through a link 10a, which is pivoted to the lever 4a andto the lower blade-holder 8a on stationary pivots, without possessinghere the longitudinal slot 11 shown in Figure 5. The lower blade-holder8a rests upon the support 9a, and is pivoted on the machine frame bymeans of the shaft 5a.

Figure 1 shows the shearing machine in the position with the greatestwidth of throat. In this position the ingot with its thick head is slidinto the shearing machine. Thereupon the shaft 5a is rotated right intoabout the position of Figure 2, wherein the lever 4a turns about thepivot 22, and the upper blade-holder descends until it comes intocontact with the abutment 21. In this position the cut begins, since thelink 10a now raises the lower blade-holder 8a, after the upperblade-holder 1a has struck against the stop 21 and can no longer moveany further downwards. In the position according to Figure 3 the cut isterminated, since the lower blade-holder 8a here assumes its highestposition. In the position according to Figure 4 the throat of the shearsis opened again so far that the ingot can be slid further on, the throatnot being opened any more than is necessary for the further advance ofthe ingot. If the shaft 511 is now turned back in reversing operation in:a clockwise direction, a fresh cut begins, since the shears then passdirectly into the position shown in Figure 3. When they thereupon reachthe position shown in Figure 2 the throat has reopened by the heightthat is necessary for the further advance of the ingot. The furtheroperation of the shearing machine for cutting rofl? individual sectionsfrom the ingot is therefore effected in reversing operation, the shearsrocking to and fro between the positions of Figures 2 and 4, and thecrank 6a always being moved over the upper :dead centre.

Only when a fresh ingot with a thick head is to be inserted will theshears be brought once into the position of Figure 1, for the purpose ofinserting the head. Under these circumstances the throat opens, byraising the upper blade-holder 1a, so far that the head can be slidthrough.

The shearing machine according to the invention can therefore be opened,simply by controlling the shaft 5a, to such an extent that the thickingot head can be inserted, whereas the cutting is effected in reversingoperation merely by controlling the shaft 511 between the positionsshown in Figures 2, 3 and 4.

The adjusting of the abutment 21 is only required when changing toingots of different dimensions.

I claim:

1. An ingot-shearing machine, comprising: a machine frame, an upperblade-holder vertically movable in the machine frame, a lowerblade-holder pivotally mounted by its rear end on the machine frame, alever pivotally mounted by its front end on the upper blade-holder, ashaft journalled in the machine frame, a crank mounted fast on theshaft, a connecting-rod connecting the crankpin ofthe said crank to therear end of the lever mounted on the upper blade-holder, a rigid linkpivotally connecting an intermediate point of the same lever to anintermediate point of the lower blade-halder, a fixed abutment on themachine frame on which the lower blade-holder rests during the openingmovement of the shears, an adjustable abutment on the machine frameadapted to stop the descent of. the upper blade-holder when the rotationof the crank shaft raises the rear end of the lever, thus causing thelink to pull up the lower blade-holder so as to fro about its upperdead-centre position, in which the throat of the shears is closed.

2. An ingot-shearing machine as claimed in claim 1, further comprisingmeans for rotating the shaft into a lower dead-centre position, in whichthe throat opening is wide enough to accommodate the head of an ingot.

3. An ingot-shearing machine as claimed in claim 2, the said link beingundispla-ceably pivoted to the lower blade-holder and to the leverpivoted to the upper blade:

holder.

488,224 Germany Dec. 23, 1929

